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Zipp Speed Weaponry Cartridge Bearings - Will not work on Zipp 188 V9 rear hubs

Zipp Speed Weaponry Cartridge Bearings: 6903/61903

Zipp's Vuka BTA sits between the arms of your aerobars so you can hydrate faster and easier, see your cyclocomputer more easily, and keep a clean, tidy cockpit. At only 104 grams, this lightweight aluminum mount is adjustable so you can position it for optimal use. The QuickView mount works with all Garmin Edge models and operates with a quarter-twist for quick mounting and unmounting.

Zipp’s Vuka Alumina Clip Extension Mounts/Armrests are made of light, strong, stiff 2014-series aluminum and have nylon armrests with wide, comfortable foam pads. They're perfect for mounting your favorite extensions (sold separately) and finding your optimal aero position. There's also a model that goes above and beneath your base bar.